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It will depend on your oil temp goals, but as a point of reference, with a 13 row Perrin oil cooler (185 F thermostat and using recommended mount location) and 0w20 oil on my car, I was seeing
- track oil temps peak ~245 F in 90 F ambient
- highway oil temps hover ~175 F in 65-70 F ambient (using my front license plate as a partial block-off)
I'm switching to 0w30 oil this year so my oil temps will probably elevate some. Ideally I'd want highway temps just a little higher and track temps a little lower, but the 13 row seems to be a good compromise in my experience (for NA). If you have FI, you'll almost certainly want a bigger cooler.
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